ExactCoxPBD

The ExactCoxPBD R package enables fitting the Cox model by optimizing the exact partial likelihood, as proposed in “An Accurate Computational Approach for Partial Likelihood Using Poisson-Binomial Distributions” (Cho et al., 2025), published in Computational Statistics & Data Analysis. [doi] [pdf] This method is especially useful for data with heavy ties or high covariate variation, providing improved accuracy in Cox model estimation.